HydroSHEDS, bölgesel ve küresel ölçekli uygulamalar için tutarlı bir biçimde hidrografik bilgiler sağlayan bir harita çıkarma ürünüdür. Nehir ağları, su havzası sınırları, drenaj yönleri ve akış birikimleri dahil olmak üzere çeşitli ölçeklerde coğrafi referanslı veri kümeleri (vektör ve raster) sunar. HydroSHEDS, NASA'nın 2000 yılında Shuttle Radar Topography Mission (SRTM) tarafından elde edilen yükseklik verilerine dayanmaktadır.
Hidrolojik olarak koşullandırılmış bu yükseklik veri kümesi, yinelemeli bir koşullandırma ve düzeltme sürecinin sonucudur. Hazırlama sürecinin orijinal DEM'i değiştirdiğini ve drenaj yönlerini belirleme dışındaki uygulamalar için yanlış hale getirebileceğini unutmayın. Kapalı havzaların (iç kısımdaki çöküntüler) akışı sonlandırmak için en alçak noktalarına veri içermeyen bir hücre "yerleştirilir". Temel dijital yükseklik modeliyle ilgili tüm ayrıntılara HydroSHEDS web sitesinden ve dokümanlarından ulaşabilirsiniz.
Bu veri kümesi, 15 yay saniyesi çözünürlüğe sahiptir. 15 yay saniyesi çözünürlükte kullanılabilen veri kümeleri; Hidrolojik Koşullara Göre Düzenlenmiş DEM, Drenaj (Akış) Yönü ve Akış Birikimi'dir.
HydroSHEDS verilerinin kalitesinin, 60 derece kuzey enleminin üzerindeki bölgelerde önemli ölçüde daha düşük olduğunu unutmayın. Bunun nedeni, temel SRTM yükseklik verilerinin olmaması ve bu nedenle daha kaba çözünürlüklü bir DEM'in (USGS tarafından sağlanan HYDRO1k) kullanılmasıdır.
HydroSHEDS, Dünya Doğayı Koruma Vakfı (WWF) Koruma Bilimi Programı tarafından ABD Jeoloji Araştırmaları Kurumu, Uluslararası Tropikal Tarım Merkezi, The Nature Conservancy ve Almanya'daki Kassel Üniversitesi Çevre Sistemleri Araştırma Merkezi iş ortaklığıyla geliştirilmiştir.
Bantlar
Piksel Boyutu 463,83 metre
Bantlar
Ad
Birimler
Min.
Maks.
Piksel Boyutu
Açıklama
b1
dk.
-415*
8454*
metre
Rakım
* tahmini minimum veya maksimum değer
Kullanım Şartları
Kullanım Şartları
HydroSHEDS verileri, ticari olmayan ve ticari kullanım için ücretsizdir. Daha fazla bilgi için lütfen Lisans Sözleşmesi'ni inceleyin.
Alıntılar
Alıntılar:
Lehner, B., Verdin, K., Jarvis, A. (2008): New global hydrography
derived from spaceborne elevation data. Eos, Transactions, AGU,
89(10): 93-94.
HydroSHEDS, bölgesel ve küresel ölçekli uygulamalar için tutarlı bir biçimde hidrografik bilgiler sağlayan bir harita çıkarma ürünüdür. Nehir ağları, su havzası sınırları, drenaj yönleri ve akış birikimleri dahil olmak üzere çeşitli ölçeklerde coğrafi referanslı veri kümeleri (vektör ve raster) sunar. HydroSHEDS, 2000 yılında elde edilen yükseklik verilerine dayanmaktadır.
[null,null,[],[[["\u003cp\u003eHydroSHEDS provides hydrographic information like river networks, watershed boundaries, and flow accumulations at various scales, derived from NASA's SRTM elevation data.\u003c/p\u003e\n"],["\u003cp\u003eThis dataset features a hydrologically conditioned DEM at 15 arc-second resolution, but the conditioning may impact its accuracy for non-hydrological uses.\u003c/p\u003e\n"],["\u003cp\u003eData quality is lower above 60 degrees northern latitude due to the use of coarser-resolution DEM data in those areas.\u003c/p\u003e\n"],["\u003cp\u003eHydroSHEDS data are freely available for both non-commercial and commercial use under the specified license agreement.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset was developed by WWF in partnership with USGS, CIAT, TNC, and the University of Kassel.\u003c/p\u003e\n"]]],["The WWF HydroSHEDS dataset, derived from 2000 SRTM elevation data, provides hydrographic information like river networks, watershed boundaries, and flow accumulation at a 15 arc-second resolution. It uses a hydrologically conditioned Digital Elevation Model (DEM), available from February 11-22, 2000. The data, free for commercial and non-commercial use, can be accessed via Google Earth Engine, and contains elevation data, ranging from -415 to 8454 meters. The dataset quality decreases above 60 degrees north latitude.\n"],null,["# WWF HydroSHEDS Hydrologically Conditioned DEM, 15 Arc-Seconds\n\nDataset Availability\n: 2000-02-11T00:00:00Z--2000-02-22T00:00:00Z\n\nDataset Provider\n:\n\n\n [WWF](https://www.hydrosheds.org/)\n\nTags\n:\n[conditioned](/earth-engine/datasets/tags/conditioned) [dem](/earth-engine/datasets/tags/dem) [elevation](/earth-engine/datasets/tags/elevation) [geophysical](/earth-engine/datasets/tags/geophysical) [hydrography](/earth-engine/datasets/tags/hydrography) [hydrology](/earth-engine/datasets/tags/hydrology) [hydrosheds](/earth-engine/datasets/tags/hydrosheds) [srtm](/earth-engine/datasets/tags/srtm) [surface-ground-water](/earth-engine/datasets/tags/surface-ground-water) [topography](/earth-engine/datasets/tags/topography) [water](/earth-engine/datasets/tags/water) [wwf](/earth-engine/datasets/tags/wwf) \n\n#### Description\n\nHydroSHEDS is a mapping product that provides hydrographic\ninformation for regional and global-scale applications in a consistent\nformat. It offers a suite of geo-referenced datasets (vector and\nraster) at various scales, including river networks, watershed\nboundaries, drainage directions, and flow accumulations. HydroSHEDS\nis based on elevation data obtained in 2000 by NASA's Shuttle Radar\nTopography Mission (SRTM).\n\nThis hydrologically conditioned elevation dataset is the result of an iterative conditioning and correction process. Note that the conditioning process alters the original DEM and may render it incorrect for applications other than deriving drainage directions. Endorheic basins (inland sinks) are 'seeded' with a no-data cell at their lowest point in order to terminate the flow. Full details of the underlying digital elevation model are available in the HydroSHEDS website and documentation.\n\nThis dataset is at 15 arc-second resolution. The datasets available at 15 arc-seconds are the Hydrologically Conditioned DEM, Drainage (Flow) Direction, and Flow Accumulation.\n\nNote that the quality of the HydroSHEDS data is significantly lower for regions above\n60 degrees northern latitude as there is no underlying SRTM elevation data available\nand thus a coarser-resolution DEM was (HYDRO1k provided by USGS).\n\nHydroSHEDS was developed by the World Wildlife Fund (WWF)\nConservation Science Program in partnership with the U.S. Geological\nSurvey, the International Centre for Tropical Agriculture, The\nNature Conservancy, and the Center for Environmental Systems Research\nof the University of Kassel, Germany.\n\n### Bands\n\n\n**Pixel Size**\n\n463.83 meters\n\n**Bands**\n\n| Name | Units | Min | Max | Pixel Size | Description |\n|------|-------|--------|--------|------------|-------------|\n| `b1` | m | -415\\* | 8454\\* | meters | Elevation |\n\n\\* estimated min or max value\n\n### Terms of Use\n\n**Terms of Use**\n\nHydroSHEDS data are free for non-commercial and commercial\nuse. For more information, please refer to the [License Agreement](https://www.hydrosheds.org/page/license).\n\n### Citations\n\nCitations:\n\n- Lehner, B., Verdin, K., Jarvis, A. (2008): New global hydrography\n derived from spaceborne elevation data. Eos, Transactions, AGU,\n 89(10): 93-94.\n\n### Explore with Earth Engine\n\n| **Important:** Earth Engine is a platform for petabyte-scale scientific analysis and visualization of geospatial datasets, both for public benefit and for business and government users. Earth Engine is free to use for research, education, and nonprofit use. To get started, please [register for Earth Engine access.](https://console.cloud.google.com/earth-engine)\n\n### Code Editor (JavaScript)\n\n```javascript\nvar dataset = ee.Image('WWF/HydroSHEDS/15CONDEM');\nvar elevation = dataset.select('b1');\nvar elevationVis = {\n min: -50.0,\n max: 3000.0,\n gamma: 2.0,\n};\nMap.setCenter(-121.652, 38.022, 8);\nMap.addLayer(elevation, elevationVis, 'Elevation');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/WWF/WWF_HydroSHEDS_15CONDEM) \n[WWF HydroSHEDS Hydrologically Conditioned DEM, 15 Arc-Seconds](/earth-engine/datasets/catalog/WWF_HydroSHEDS_15CONDEM) \nHydroSHEDS is a mapping product that provides hydrographic information for regional and global-scale applications in a consistent format. It offers a suite of geo-referenced datasets (vector and raster) at various scales, including river networks, watershed boundaries, drainage directions, and flow accumulations. HydroSHEDS is based on elevation data obtained in 2000 ... \nWWF/HydroSHEDS/15CONDEM, conditioned,dem,elevation,geophysical,hydrography,hydrology,hydrosheds,srtm,surface-ground-water,topography,water,wwf \n2000-02-11T00:00:00Z/2000-02-22T00:00:00Z \n-67.3 -180 60 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [](https://doi.org/https://www.hydrosheds.org/)\n- [](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/WWF_HydroSHEDS_15CONDEM)"]]
